fix: use `ApprovalType.TransactionBatch`

[vinistevam]

Description

This PR aims to change the hardcoded transaction_batch to use the ApprovalType.TransactionBatch

Related issues

Fixes: https://github.com/MetaMask/MetaMask-planning/issues/5143

Manual testing steps

Functionallity not available to the user

Screenshots/Recordings

Before

After

Pre-merge author checklist

• [x] I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• [x] I've completed the PR template to the best of my ability
• [x] I’ve included tests if applicable
• [x] I’ve documented my code using JSDoc format if applicable
• [x] I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• [ ] I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• [ ] I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.